Environment Canada has issued a yellow frost advisory for Port Colborne and the surrounding region, warning residents to protect plants from freezing temperatures expected over the weekend. The advisory was first issued on Thursday, April 30, 2026, and updated on the morning of Friday, May 1, 2026.
According to the federal agency, patchy frost is likely to develop Friday night as temperatures drop to zero. The cool conditions are expected to continue into Saturday night, with forecasts calling for clear skies and a low of plus one degree. The advisory, which remains in effect for the Niagara Falls, Welland, and Southern Niagara areas, carries a moderate impact level, indicating that the weather could cause damage to sensitive vegetation.
The Government of Canada uses a colour-coded system for weather alerts, where a yellow advisory signifies that hazardous weather may lead to moderate or localized damage. Gardeners and farmers are encouraged to cover vulnerable trees, crops, and plants to prevent damage from the cold.
While the average date for the last spring frost in Port Colborne is typically April 29, there remains a 30 percent chance of frost occurring after this period, according to data from the Farmers Almanac. The current cold snap is part of a larger weather system affecting much of southern Ontario, including the Hamilton and Niagara regions.
